Light Absorption for Photosynthesis

Record or report findings.
Rate of photosynthesis (measured by ET50, time it took for 50% of the leaf disks to float up)
Color of light (wavelength of light)
Light intensity, temperature, bicarbonate concentration (0.2%), depth of bicarbonate solution, direction of incoming light, pH, amount of soap, size of leaf disk, type of plant
Ten trials for each color, however for each trial, a few disks did not float up.

when testing the black light for its effect on photosynthesis.

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.

Photosynthesis: Overview of the light-dependent reactions

This image of the Black Sea, acquired on June 20, 2006, by the MODIS on the Aqua satellite, shows swirling blooms of phytoplankton coloring the surface waters blue and green. The large volume of freshwater flowing into the Black Sea from large European rivers, including the Danube and Dnieper Rivers, makes the sea much less salty than open oceans. The freshwater flow also delivers many nutrients, which are washed into the sea from land. These nutrients support large blooms of phytoplankton: microscopic photosynthetic organisms (algae and bacteria). The chlorophyll and other pigments the organisms use for photosynthesis change the way light reflects off the surface, and these changes are visible in satellite imagery.

What Is the Importance of Chlorophyll for Photosynthesis?

This article will examine photosynthetic efficiencies of various LEDs. Specifically, six light sources were tested for photosynthetic responses by zooxanthellae found in the stony coral (most likely of Clade C15.) The light sources include a black light (mostly UV-A produced by a fluorescent lamp), and LEDs radiating energy at peaks of 400nm (UV-A/violet), a 418nm LED (producing mostly violet with a small amount of UV-A), a blue/white LED combination peaking at white light with a peak 443nm and 457nm, a 'white' LED with a blue peak at 443nm, and red LEDs producing maximal light at 631nm and 657nm. All tests were performed when light intensity was at sub-saturating levels. Evidence suggests absorption by carotenoids is responsible for lessened photosynthetic efficiencies at 450 nm and 470 nm.

We based this hypothesis off of the wavelengths used in the light reactions during photosynthesis.

Are plants using green light for photosynthesis

These components are found within the chloroplasts of a plant cell (see diagram below).

Each type of receptor is responsible for absorbing one type of light.

The Effect of Black Light on Plants | Hunker

Red light was second-most efficient, but the blue and UV lights were not successful; no chads floated in these environments.
Energy + 6CO2 + 6H2O ----> C6H12O6 + 6O2
Equation of Photosynthesis:
Independent Variable: time
Dependent Variable: number of leaf chads
Control: Absence of Light
Constants: concentration of baking soda in the solution, time allowed for the experiment, and the number of chads put in the solution to test.

Lack of chlorophyll/chloroplasts in the plant cells reduce the plant's capacity to photosynthesise.

To show experimentally that light is necessary for photosynthesis.

Effect of different colors of light on the rate of photosynthesisThe effect of different lights on plant growth: incandescent light, fluorescent light, sunlight and black light.

Red light is important in the promotion of photosynthesis. See Figures 16 - 18, and Table 8.

Investigating the light dependent reaction in photosynthesis

PAM Fluorometer: A device capable of monitoring chlorophyll fluorescence, and is capable of calculating the fate of absorbed light energy, either through photosynthesis or two other dissipation pathways (including NPQ: Non-Photochemical Quenching of chlorophyll fluorescence by protective xanthophylls) or NO (dissipation by other pathways, including photoinhibition.) PAM stands for Pulse Amplitude Modulated light intensity. PAR (Photosynthetically Active Radiation): That visible light energy between 400 and 700nm. It is important to note that photosynthesis does not simply stop at wavelengths below 400nm - violet and some ultraviolet wavelengths can promote photosynthesis!

The Three Little Light Receptors The first step of Photosynthesis involves the plant absorbing light cast from the Sun.

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If white light is a mixture of several wavelengths of colors and the chlorophyll in green leaves absorb energies from all visible light except green, then exposing white light to a green plants will result in the fastest rate of photosynthesis, followed by blue or red.